kind of getting to talking about culture environment. compare the air force to other services and you talk about environment, how much of it -- have either of you ran the numbers or seen any numbers? how much of this people who will are comfortable in their situation and created a bad environment instead of having changeover and holding people accountable more often than not? general rice, do you see where i'm going with that? >> let me tans question, if i don't answer it fully please re- ask it. i agree having people in an environment that can be as challenging as basic military training for too long a period of time exposes them to, i think, issues and challenges that could be corrosive over time. we have to watch how long we allow people to serve in these situations. we're going to restrict the amount of time how long you could serve as an instructor it is going to be three years, it used to be four years. we're going to divide the duty day so you will not have contact with trainees. it is a way of getting at this issue of exposure ov